Brinkhaus Because we are a high specification manufacturer we have invested in weaving technology and machinery that enables us to produce a pure high quality cotton ultra close weave fabric. After manufacture and mechanical finishing (not chemical) the weave of the Morpheus dust mite barrier is so tight that the density is smaller than the body size of the household dust mite thus preventing it from coming through the fabric. The open area between the warp and weft threads is minute, measuring between one third and two thirds of the body size of the young dust mite and around 10% of the size of the adult dust mite to prevent them passing through the weave.100% CottonMachine Wash 95°CCotton casingStandard pillow Shop At House Of Fraser